[g__day (Matthew)]

Hi Glen,

Thanks for sharing that - SQM is my next project. My understanding is SQM may vary across the sky - but I guess I am most interested in SQM in the region where my OTAs are pointing.

So in shared shots - I can see from start of night (ASTAP solved 60 second image versus deep at night 300 second solved Luminance filter image) the SQM varies from a Bortle 9 SQM 16.32 to Bortle 8 SQM 18.08 Sydney surburan night sky.

My second thought was SQM for a stable sky should be a slowly changing piece of data - so I am hoping APT can leverage ASTAP to calculate the SQM periodically.

Re the batteries comment - keep them fresh - are batteries still needed on the SQM-LE model which nowadays has a 5V DC input source?

Many thanks,

Matt